Population genetic structure of North American burbot (Lota lota maculosa) across the Nearctic and at its contact zone with Eurasian burbot (Lota lota lota)
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چکیده
The burbot, Lota lota (Teleostei: Gadidae), has a holarctic distribution, with one subspecies (Lota lota lota) living in the lakes and rivers of the Palaearctic and northwestern North America and the other (Lota lota maculosa) living in the Nearctic (except the northwest). We analysed nine microsatellite loci and the mitochondrial DNA control region of 350 burbot sampled across North America to develop a continent-wide understanding of population differentiation following postglacial recolonization. Using mitochondrial DNA, we identify three subclades of L. l. maculosa: one is widespread, one is moderately well distributed, and the third is restricted to the southwest. Lota l. lota is restricted to Yukon and Alaska. Microsatellite loci show moderate levels of genetic diversity and high population differentiation throughout North America (Rst £ 0.9). Lota l. maculosa and L. l. lota mtDNA lineages only co-occur appreciably in Great Slave Lake. An individual-based Bayesian approach to detect genotypic admixture indicates that very few of all individuals show signs of admixture between subspecies, and those individuals are restricted to Great Slave Lake and Lake Laberge. Résumé : L’aire de répartition de la Lotte, Lota lota (Teleostei : Gadidae), est circumpolaire avec une sous-espèce (Lota lota lota) vivant dans les lacs et rivières du paléarctique et le nord-ouest de l’Amérique du Nord, et l’autre sous-espèce (Lota lota maculosa) vivant dans le néarctique (sauf le nord-ouest). Nous avons analysé neuf microsatellites marqueurs génétiques et l’ADN mitochondrial (région de contrôle) des Lottes. Les échantillons nord-américains on été prélevés afin de comprendre la différenciation génétique de la population à traver tout le continent suite à la colonisation post-glaciaire. L’ADNmt identifie trois clades génétiques dans L. l. maculosa : une clade est très répandue, une autre est distribuée modérément, et la troisième se retrouve seulement dans la région du sud-ouest. Lota l. lota se retrouve seulement dans les territoires du Yukon et Alaska. Les marqueurs microsatellites montrent un niveau moyen en diversité génétique mais une différenciation génétique élevée entre populations à travers l’Amérique du Nord (Rst £ 0,9). Les lignées ADNmt de L. l. maculosa et L. l. lota coexistent seulement dans le Grand lac des Esclaves. Une approche Bayesianne, basée sur les individus, dans le but de détecter le mélange génétypique, indique que peu des Lottes montrent un brassage génétique entre sous-espèces; ils se retrouvent seulement dans le Grand Lac des Esclaves et Lac Laberge.
منابع مشابه
Population genetic structure of North American burbot (Lota lota maculosa) across the Nearctic and at its contact zone with Eurasian burbot
The burbot, Lota lota (Teleostei: Gadidae), has a holarctic distribution, with one subspecies (Lota lota lota) living in the lakes and rivers of the Palaearctic and northwestern North America and the other (Lota lota maculosa) living in the Nearctic (except the northwest). We analysed nine microsatellite loci and the mitochondrial DNA control region of 350 burbot sampled across North America to...
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